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Old 31st October 2014, 09:32 PM   #1
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Default Squeezebox Touch PSU

Hi, I tried a few Squeezebox power supplies but I found they had some drawbacks in either the size, price or the HF/RF filtering department. Cheap chinese PSU boards on Ebay all lack something so it seems not many complete boards are out there. The Squeezebox needs a better PSU as the original SMPS does not give the best results.

So I made this replacement linear very low drop low noise PSU that can deliver 5 V 3 A. It performs quite good although I am still testing and trying out stuff. Originally I started with a discrete design but quickly converted to recent regulator ICs. Some of those newer ICs had non optimal features and only 2 types remained. I leave it to you to check the picture which chip is being used

Design goals were:

- must be a linear PSU
- low noise
- as compact as possible
- one board solution
- good HF/RF filtering both at input and output
- high reliability so "constant on" capable (please understand that I can not guarantee anything here)
- Low heat emission, low power loss i.e. as "green" as possible for a linear power supply
- rugged + overdimensioned

As a result it has adequate (IMHO) input and output CLC RF filtering which is not found on most replacement PSUs. Diodes are separate 5 A Schottky types, there are 2 output terminals for optimal cable routing and it has a green power LED (it won't accept blue LEDs just like me) as both a minimum load and as luxury item. I added pads for using an RC snubber circuit but haven't tried that myself yet. Either SMD or through hole resistors can be used for the voltage setting. Since I don't like modular designs it is a plain and simple one board solution. Just connect a 6 V transformer and output cabling and it is ready to be used. Testing is being done with special Rcore transformers that came on my way when the design started and at full load those are virtually silent + relatively cool and their stray field is low. I also use some O2 Joggler devices that can be connected to this PSU as well. As you can see it is quite compact, more compact than most replacement PSUs anyway. The idea is to cut off the cable of the original Squeezebox SMPS and connect it to this board.

I am posting this in the Digital Source section as I think it is the most appropriate section. Although being used to questions I will not respond to: "can I use a 24 V transformer that I have ?" and the like. The correct part values and types and the right transformer type will be in a BOM and that's it. I will spend considerable time in testing parts and discussion on the parts can be fun for you but not for me
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Last edited by jean-paul; 1st November 2014 at 07:57 AM.
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Old 31st October 2014, 09:35 PM   #2
6speed is offline 6speed  United States
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Quote:
Originally Posted by jean-paul View Post
Hi, I tried a few Squeezebox power supplies but I found they had some drawbacks. I made this replacement linear low drop low noise PSU that can deliver 5V 3A. It performs quite good although I am still testing. I tried to make it as compact as possible. It has adequate input and output RF filtering IMHO.
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Old 31st October 2014, 10:11 PM   #3
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Let me first test this device some more. Since I have waited for months for the boards I could not be patient anymore and posted this somewhat prematurely in my enthusiasm. I made 3 versions for testing. The one on the picture is the first one, I made the others with larger heatsinks. Also various different tantalum caps are being tested.
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Old 1st November 2014, 01:07 AM   #4
Eldam is offline Eldam  France
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Hi,

Did you decide of a price for the pcb ? Is there a box ref in the BOM

Will you have one day a SB Duet ?
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Old 1st November 2014, 07:36 AM   #5
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What is a box ref ? No price known yet. As said: I made the mistake by posting this in my enthusiasm. I am still testing parts and measuring. As you know I want to deliver quality which costs time. This PSU should be best-of-class otherwise it won't have sense to build one IMO.

I don't have a Duet and I know nothing about them. It is kind of standard here not to bother with things you don't know. I have a Touch which is the reason i made a PSU for the Touch. If the Duet also likes 5 V DC at max. 3 A then it is fine, otherwise you are on your own. For those that need 8.7 V and have transformer that gives 110 V this project is not the right project. Please see post #1 for what the definitions are.

Checked my stock and I think I can make 20 sets of PCBs complete with a Rcore transformer for European builders. That is if there are any guys that want to build one Shipping costs and difficulties prohibit from sending out of Europe. But first testing and when everything is OK a GB can be discussed.
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Old 1st November 2014, 09:59 AM   #6
Eldam is offline Eldam  France
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Pardon, my french ! I meaned : case-box (cabinet; housing) reference on Mouser/Digikey/Farnell/R-S (e.g. Hammon number xxxx and an alternative one...oups 2 BOM = too much choice and confusion) to cloth the cute board...

But like the Squeeze-Box Duet (9V) it was a second degree joke, sort of private joke for you because your advert about caps mods and time spent for optimisation. Life is too short for sense of humour you may have right !

I'm sure this PSU is good enough ,thank you... great. (not second degree)

Did you benchmark it both with scopes and ears with the one maid for the Subbu as well. Noise floor is lower ? (not second degree questions!).

Saw Subbu bought 2 Distinction-1541 boards... do you have also some others PSU for our special Squeeze Box which needs also - 5 V and -16V (second degree question) ?

regards....
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Old 1st November 2014, 10:12 AM   #7
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Syntax error, input overload.....it seems better just to wait and see what comes Eldam. It is not a dictate and change project, think of a diode please

I don't agree life is too short for humor, on the contrary ! Life is too short for waisting time. So please see post #1 to know what this PSU does. If you need something else then please look elsewhere.
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Old 1st November 2014, 10:46 AM   #8
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BTW "good enough" is not good enough.
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Last edited by jean-paul; 1st November 2014 at 10:56 AM.
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Old 1st November 2014, 10:55 AM   #9
Julf is offline Julf  Europe
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Quote:
Originally Posted by jean-paul View Post
The Squeezebox needs a better PSU as the original SMPS does not give the best results.
So what problems did you find with the original supply, and how much improvement do you get with the linear supply?
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Old 1st November 2014, 11:26 AM   #10
Eldam is offline Eldam  France
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Hi JP,

As I said, it is good as it is ! Good enough is good enough, and personal cursor level is personal cursor level, people are free to mods and cominicate with no offense to the designer. Sorry for diodes, not dictate way of communication to me... nore from me ! Btw, readed your advertisement about mods, caps, etc !

Was just sense of humour and also to overlight your off the shelf diy no dictate project... As I understood french humour is different than Dutch your one () I putted above selfies and explanations in () !

PS: prefer the resistor (can travel in the two sens) instead diode! resistor is said resistance in french also... ahhh the French Resistance ... always bad litterature in France !

Thanks for sharing, regards

Eldam
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